2027 ICD-10-CM Diagnosis Code H55Nystagmus and other irregular eye movements

ICD-10-CM Codes›H00–H59›H55-H57›H55

ICD-10-CM H55
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

H55 is a non-billable ICD-10-CM category code for nystagmus and other irregular eye movements, so it cannot be submitted on claims. Use a more specific code from this category instead, such as H55.00, H55.01, H55.02, and H55.03.

Code Identity

ICD-10-CM Code
H55
Billable Status
No — Non-Billable Category
Code Describes
Nystagmus and other irregular eye movements
Short Description
Nystagmus and other irregular eye movements
Same as the full description in the CMS dataset.
Chapter
H55-H57
Other disorders of eye and adnexa

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH55-H57Other disorders of eye and adnexa
CategoryH55Nystagmus and other irregular eye movements
This CodeH55Nystagmus and other irregular eye movements

Specific Coding for Nystagmus and other irregular eye movementsOverview

Non-specific codes like H55 require more characters. Use one of these billable codes instead:

  • H55.0 for Nystagmus

  • Use H55.00 for Unspecified nystagmus

  • Use H55.01 for Congenital nystagmus

  • Use H55.02 for Latent nystagmus

  • Use H55.03 for Visual deprivation nystagmus

  • Use H55.04 for Dissociated nystagmus

  • Use H55.09 for Other forms of nystagmus

  • H55.8 for Other irregular eye movements

  • Use H55.81 for Deficient saccadic eye movements

  • Use H55.82 for Deficient smooth pursuit eye movements

  • Use H55.89 for Other irregular eye movements

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to H55: its own notes plus those printed at Chapter 7. A note printed at a category, block or chapter applies to every code under it.

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 7 (H00-H59) Diseases of the eye and adnexa applies to 2,677 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • diabetes mellitus related eye conditions (E09.3-, E10.3-, E11.3-, E13.3-)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury (trauma) of eye and orbit (S05.-)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • syphilis related eye disorders (A50.01, A50.3-, A51.43, A52.71)

Notes

General instructions on how these codes are used.

From Chapter 7 (H00-H59) Diseases of the eye and adnexa applies to 2,677 codes
  • Use an external cause code following the code for the eye condition, if applicable, to identify the cause of the eye condition

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name H55, its category, or a range that includes it.

Applicable To 1

These notes mention H55.

  • Z83.51 Family history of eye disorders
    Conditions classifiable to H00-H53, H55-H59

Excludes2 1

These codes carry an Excludes2 note naming H55: its condition is not part of those codes, and both may be reported when the patient has both.

  • Block H49-H52 Disorders of ocular muscles, binocular movement, accommodation and refraction
    nystagmus and other irregular eye movements (H55)

Patient EducationClinical

Eye Movement Disorders

When you look at an object, you're using several muscles to move both eyes to focus on it. If you have a problem with the muscles, the eyes don't work properly.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About H55Overview

What is the ICD-10 code for nystagmus and other irregular eye movements?

H55 is the ICD-10-CM category for nystagmus and other irregular eye movements, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is H55 (Nystagmus and other irregular eye movements) a billable code?

No. This is a category header that groups the codes for nystagmus and other irregular eye movements, and headers cannot be submitted on claims. Claims for nystagmus and other irregular eye movements need a more specific code from this category, such as H55.00, H55.01, and H55.02.